config.mk: improve feature test check
this fixes a crash on NetBSD because it requires -D_XOPEN_SOURCE (strdup, usleep). thanks k0ga and stateless for reporting and fixing this issue!
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		@@ -23,7 +23,7 @@ INCS = -I${X11INC} -I${FREETYPEINC}
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LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS}
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# flags
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CPPFLAGS = -D_BSD_SOURCE -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
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CPPFLAGS = -D_BSD_SOURCE -D_XOPEN_SOURCE=500 -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
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CFLAGS   = -ansi -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
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LDFLAGS  = -s ${LIBS}
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